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One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition
Wen, YC; Yu, Y; Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
2005
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号72期号:4页码:-
摘要We study the one-band Hubbard model at half filling with hopping asymmetry and its effective model at finite but large U up to the second order of t(mix)/U. Two variational wave functions, the resonating valence bond (RVB) wave function and antiferromagnetic (AF) RVB coexisted wave function, are studied by variational Monte Carlo method on LxL square lattices up to L=12. Based on these two wave functions, the phase diagrams for both models are presented. For the Hubbard model, we find that there is a metal-insulator transition when the hopping parameter t(mix) which changes the local double occupant vanishes while only a metal-insulator crossover is explored for any finite t(mix). For the effective model in which the perturbation expansion is up to the second order of t(mix)/U, a clear metal-insulator transition can be identified for both variational wave functions and the phase diagram can be drawn accordingly. In both models, we find that the systems are dominated by AF-RVB wave function when U is large while the RVB wave function is favored when U is small.
部门归属Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Valence-bond State Pairing Correlations Antiferromagnetism Superconductivity La2cuo4
学科领域Physics
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收录类别SCI
WOS记录号WOS:000230890300046
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13797
专题理论物理所1978-2010年知识产出
通讯作者Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
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GB/T 7714
Wen, YC,Yu, Y,Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.. One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition[J]. PHYSICAL REVIEW B,2005,72(4):-.
APA Wen, YC,Yu, Y,&Wen, YC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2005).One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition.PHYSICAL REVIEW B,72(4),-.
MLA Wen, YC,et al."One-band Hubbard model with hopping asymmetry and the effective theory at finite U: Phase diagram and metal-insulator transition".PHYSICAL REVIEW B 72.4(2005):-.
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